Typewriter  telegraph



May 22, 1928. 1,670,421

F. D. PEARNE ET AL TYPEWRITER TELEGRAPH Filed July 16, 1926 4 Sheets-She 1 mm mm mmm mm ll Mimi! ill, We

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May 22, 1928. 1,670,421 F. D. PEARNE ET AL TYPEWRITER TELEGRAPH Filed July 16, 1926 14 Sheets-Sheet 3 605272665629 [IT/2272A fl. Pea 7726.

May 22, 1928.

1,670,421 F D PEARNE ET AL TYPEWRITER TELEGRAPH Filed July 16, @926 14 Sheets-Sheet 6 R {i Q Q 3 Q w 172 U672 Z0717. Fran/r Z2 Pearne. L a wr'wwe ZFQoZsc/z. {in P 25 May 22, 1928. 1,670,421

F. D. PEARNE ET AL TYPEWRITER TELEGRAPH Filed July 16, 1926 14 Sheets-Sheet 7 Insulation Insulctlian fix jnz/enma 7 50111 DZPear/ze Lawrence 9075212. LUiZneSSai a. .ZWMQ. g

May 22, 1928.

F. D. PEARNE ET AL TYPEWRITER TELEGRAPH Filed July 16, 1926 14 Sheets-Sheet 8 22 2725 L a u iwnce 55% J L fin .nnumunmmmum May 22, 1928. 1,670,421

F. D. PEARNE ET AL TYPEWRITER TELEGRAPH Filed. July 16, 1926 14 Sheets-Sheet ll rmuumfy/imuununmm fzzb ak Tn a w a o, g y 4 m w F L. (Dp. a W a .I M Q? 2 Fa Mm m L mm EM 6 W w R 1 mm QNN R a A w y J we a WW7 .v. n. a M Ufl May 22, 1928. 1,670,421

F. D. PEARNE ET AL TYPEWRITER TELEGRAPH Filed July 16, 1926 14 Sheets-Sheet 13 F. D. PEAR-NE ET AL May 22, 1928.

TYPEWRITER TELEGRAPH Filed July 16, 1926 14 Sheets-Sheet l4 [72067220751 FfCZ/YA D. Pearne Lczawenc e ETyOZFQ/ L. W pa Patented May 22, 1923.

UNITED STATES PATENT OFFICE.

FRANK '13. smear. Ann LAv/RE'NCE consort, or CHICAGO, ILLI'N'oIs, asszsnon's,

sr vis sam iissmamars, To wise TRANsIvIITTiNG 'IL'm'ivoIs, A C'CRPORATI'ON' or DELAWARE.

CORPORA'iiON, or CHICAGO,

TYPEWRITER TELEGRAPH.

Application filed July 16,

This invention relates to improvements in printing telegraphs,- more particularly the typewriter telegraph, wherein one typewriter is caused to respond to the operations of another distant typewriter. 7

he invention is chiefly characterized by the use of standard typewriters and attaching nieclianisni connected thereto for pro d-ucing or utilizing; two spaced impulses over a single telegraph line, the impulses beingdiiferently' spaced for different letters and the character of the second impulse being differentiated to selectively operate printing mechanism for ditl'erent groups of the letters. The first impulse sets timed distributing mechanism into operation to successively select the individual keys of each group, and the second impulse is timed from the starting impulse at the proper interval to operate the desired key, and is properly proportioned to operate in the group containing the same.

, The timing. or distributing meclmuism starts from zero position at each key operation so that the several distributors'are corrected for synchronizing at each operation. In order to increase the interval between successive keys, the keys are divided into groups which are simultaneously etlected by the one distributor in each typewriter.

The main objects of this invention are to provide an efficient typewriter telegraphing device which is operable over a single line wire bv variably spaced impulses, and sub stantially independent of the length or duration of any impulse; to increase the speed of operation of such devices; to provide improved means for sending a starting impulse OYQI the line and then changing the connections to make the line responsive to a second impulse: to provide an improved RE F-locking and releasing device: to provide improved means tor connecting the distributor shaft to the constantly driven niotor; to provide an improved electromag- 1926. Serial No. 122,915.

clutch for attaching the printing mechanism to a constantly driven shaft and to provide such a system whereby the operations are controlled by a few simple relays and lockingaip devices, together with a simple system of cam operated switches.

An illustrative embodiment of this invention is shown in the accompanying drawings.

Figure 1 is a circuit diagram of one complete typewriter station.

Fig. 1-"- supplements and completes the diagram in Fig. 1. and shows the mechanical relation of parts which cannot be fully shown in Fig 1 withoutgreatly complicating the diagram.-

Fig. 2 is a circuit diagram o t two interconnected typewriter stations, the left side showing only the elements used in sending, and theright side showing only the elements required for receiving.

Fig. 3 is a tragmental elevation of the left end of the typewriter.

Fig i is an elevation of the right end.

Fig. 5 is a plan section taken substantially on the line 5 5 of Fig. 3 and shows the general arrangen'ient of the teleg'aphing attachment.

Fig. 6 is a cross section taken on the line 62-0 of Fig. 5.

Fig. 7 shows a changed position of the parts illustrated in Fig. 6 as in sending, with dotted line positions for he parts in the receiving machine.

F 8 is a rear elevation ofthe typewriter with parts broken out.-

Fig. 8 is an end view of the switch operating cams shown at the lower right hand side of Fig. 8.

Fig. 9 is a plan section taken below the operatinn levers substantially on the line 9 9 of Fig. 6.

10 is a sectional elevation taken on the line 1010 of 6.

11 is a sectional elevation taken on the line 1l-11 of Fig. 6. I

Fig.- 12 is a plan section taken on the irregular line 12-12 of F ig. 6.

Fig. 13- is a perspective view of the distributor drive gear and latch show in Fig. 12.

Fig. it is a frag-mental sectional elevaw 6:3; And

tiontalren substantially on the line l l l l. of Fig. 8.

Fig. is a sectional elevation of the clutch mechanism and is taken on the line 15-15 of Fig. 5. i

Fig. 16 is a plan view of the relay board and co-assembled parts.

Fig. 17 isanelevation of the left hand 01"; the board.

Fig. 18 is a detailed view of the contacts shown in Fig. 17.

Fig.19 is a sectional elevation taken on the line 1919 of Fig. 16.

Fig. is taken on the line 20-20 of Fig. 16.

In this invention a distributor is rotatively mounted in a frame underneath the typewriter and is provided with lingers arranged in tour complete spirals, which lingers are respectively related with corresponding hey bars of the typewriter. A lever is also provided for each key bar, the levers being pivotally mounted in the frame in transverse relation with the corresponding linger of the distributor. A normally open starting switch is closed by depressingany one of the type writer lteys, which switch connects the distributors to continuously operating synchronized motors, sets up the line for receiving the second impulse when the sending distributor is in. cooperative relation with the depressed key, and locks up the local power at the receiving typewriter into connection with the printing magnets, the circuit of the proper magnetbeing completed by the second impulse. The distributors, in addition to cooperating with the sending keys to time the second impulse, successively operate a contactorin similar timed relation forcach lever, which makes the lever in the receiving machine, and the connected key bar, respon' sive by placing the lever in engageablerelation with the actuating device, which is clutch connected to a continuously rotating drum by theiprinting magnet. That is, when the second impulse is given the printing magnet of the receiving typewriter is actuated at the proper interval to engage and operate the key on the receiving machine which corresponds to the depressed key on the sending machine.

l-Vhen the distributors of each machine have made one complete revolution they are automatically iflisconnected and stopped in the same idle positions; and, by means of switches operated by cams on the distributing shaft, the locked circuits are broken and the circuits then put, in condition for receiving another starting impulse. One printing magnet is provided for each group of keys related "with. each complete spiral. The first impulse connects allot the printing. magnets .to one side of the battery and the second impulse is adapted to select and lock up the circuit of any one of the mag I underneath the standard form oi. typewriter 2 and constitutes a support therefor. The key levers 4: are pivotally mounted on the transverse shaft 5which is secured in the side walls of the tranle 1; and each of the levers '1 is connected to the corresponding typewriter key bar (5 by means of the mo tion reducing links I and S. The links are pivotally connected at one end, the opposite end of the link 8 is pivoted to the rod 9 secured in the frame 1, and the opposite end of the linl; 7 is pivoted to a pin 10 provided in one side of the corresponding typewriter hey bar 6. The :liront ends ot the lovers 4 are pivoted to the medial portions of the respective levers 8. The lever 4: is held in the normal posit-ion shown in Fig. (i by the return spring and stop mechanism of th corresponding typewriter bar 6.

When any one of the keys of the typewriter or the space bar is depressed, the normally open starting switch 11 is closed. The switch 11 is mounted on the cross bar 12, securedto the frame 1. The rear ends of the levers 4L bear against a bail 121, which is pivotally mounted in the frame 1. Aninsulating contactor 14 is mounted on the center of the bail to bear against the lower leaf of the switch 11 for closing the same. Nor mally the bail 13 is resting on the rear ends of the levers 4 with the contact block l-t disengaged from the switch 11.

The distributor wheel 15 is rotatably mounted in the frame 1, below and in transverse relation with the bank of levers. The wheel comprises a phju'ality ol' spirally disposed cam lingers 16, which are. a'rrangeil in tour complete spirals, one finger being provided. for and related with each ot' the levers 4. In this manner the :liortytwo .licys ot' the typewriter are divided into i'unr groups; ten, including the space bar. in the first group; and eleven in each of the three remaining groups. The distributor is given one con'iplete turn at cuchkcy operation, and, by arranging the lingers in tour complete spirals, the cycle is divided into only eleven intervals instead of torty two, as would be required if the keys were not grouped. Thispermits greater speed of operation without shortening the intervals in which different elements are required to act.

Since the distributor wheel 15 is turned one complete revolution at each key opera-. tion, as will be described hereafter, the distributor constitutes a timer for selecting the different keys of each group at ditl'erent intervals from the starting impulse. Then, to select a group, tour printing magnets 17 are provided, one in each group, to connect the corresponding key actuator bar 18 to the constantly rotating shaft 1. The shaft 19 is rotatively mounted across the frame and is driven by the small motor 20, which is Inountd at the right side of the frame 1, and connected directly to local power. The bars 18 are pivotally mounted in bail frame niei nbcrs 21. which are pivoted on transverse rod 252, secured l'ictween the side walls of the Frame 1. The bars 18 are yieldingly .d 't'orwziird against stop pins 28, in the bail bymcans of the sp "lug 2st which is lied to the rear portion ol the f 'ame 21 and. to the upper portion of a plate 25, which pres.

2 1'1 the i'ranie 2i and bears against the l nvcr side of the bar 18. For rach printin mechanism the shaft 19 is provided with grooved brake drum 26, which is adapted no trictionally engaged by a fibre block sec :l'GCl in the depend-n1 lever 2%. which is plvotally connected to the swingg'able end of the corresponding actuator bar frame 21, and hangs directly in front of the brake drum 26. The lever 29 is dcpendingly pivotc l on a. statizmary cross rod 3O secured in the frame and is located directly behind the drum The lower ends o t the lovers 22% and 29 are pivotally connected to the opposite ends of the connecting link 31. Then the rear end of the frame 21 is resiliently urged upward by means of a spring 3;, which is connected to a stationary cross bar 33 and is attached to the extended end 34 of the link 31.; a stop is provided by means of a fixed transverse rod 35, which is contacted the uppe edge of the link 31.

The printing magnets 17 mounted on a stationary lrame cross bar 36 in positional relation to the link 29 of the correspondin; group actuator. An armature $37 is attached to the medial portion of the l nk 29. so that when the printingmagnet 1? ene e ized the block ot the lever 28, which linked to the lever 29. is drawn into contact with the rotating brake drum 2h. The lever is thereby pulled dowu- 7. that the actuator bar 18 ne switch 39 is stationarily mounted on fixedly wardly into the position shown in. dotted,

the lower end of a bracketlO, which is attached to the cross bar 36 and is commonly actuated by the link 31, in each of the four actuator mechanisms, which links contact with the transverse portion of a bail ll, which is pivoted in the side of the frame 1 and provided with an insulating contact block 42 for separating the leaves of the switch 3 The bail 4C1 is resiliently held upward against the stop pins 43, secured in the il'rame 1, by means of the contractile spring -i-Ll-.

The levers lof each group, are successively rendered engageable by the actuating bar 18 by means of the contactor blocks 38,- which are slidably mounted on each bar 4; and shifted by bell crank levers -15. The bell crank levers are pivotally mounted on a stationary transverse rod -16, secured into the side walls of the frame 1; The upper arm 4;? of each crank is slotted and eiiejiigcss a pin -18 in the contact slide 38', and the horizontal arm 1-9 is engaged by the cor responding one of the distributor cam lingers ill to rotate the crank counter clockwise, as viewed in Fig. 6, to move the contactor :38 from the position there shown to the l'hflhw'lilon shown in Fig. 7, where it is in engageahle relation with the bar 18. Normally the contact 38 is held forwardlyby means of a spring -l. which draws the vertical arm into contact with a fixed transverse rod 50. The spring 19 extends between the arm l7 and a transverse bail 51, which is dcpendingly pivoted in the side walls oi the frame .1, and is adjusted to tension the springs 4-9 by means of a rod 52, wh ch hooks onto the transverse portion of the bail 5i and is held by a nut 53, threaded on the front end of the rod 52, hearing \5?""ll; il an upright bracket secured to the lined transverse supportbar 55.

A horizmntal lock lever 56 for each lever 4-. is pivoted to a vertical lever 15, which is slotted at the upper end and engages a pin 58 in the corresponding: lever l. The medial port ons of the lock levers 56 are pivoted on a stationary transverse rod 59 secured in the side walls of the frame 1. i

Since keys are simultaneously effected in lUi) llU

ditl'erent groups an arrangement is made whereby the sending circuit t'or only the dcprcssed key is completed. This is acconn plished by providing a sending switch 60. one for each key; which is rigidly mounted on a fibre block 61 secured to the cross frame member The switches are adapted to be partially closed by the distributor member and partially closed by depressing the key, so that cooperation is required between a depressed key and a distributor tingerto completely close the switch. The upper leaf 60 is pressed downwardly by means of a pivot-ed insulating block 62, which is pivotal 1y supported in a bracket 63 attached to the lock levers 56.

support 55, and engages the lower end of the vertical bar 57, which is connected to the lever 4t, The lower leaf 60 rests on the pivoted insulating block 6 1, which is pivotally mounted on a stationary transverse rod 65, secured. in the frame, and bears against the upper-surface of the end of the horizontal bell crank arm 19. As shown in Fig. 7, the lever and the distributor arm each press the corresponding switch leaf part way to close the switch, and the simultaneous operation of botbthe lever and the distributor arm is required to bring the leaves 6O and 60"; into contact to close the switch. The

, pivoted blocks 62 and 64 are provided to furnish a degree of resiliency to avoid a solid connection: which might break some of the operating members.

Thedepressed key .is locked down until the distributor wheel. has finished its revolution by means of the rod 66, which is yieldingly supported by the spring arms 67, attached to the fixed frame bar 68, to bear against'the upper angular surface 69 of the pointed end of the locking lever 56 in the normal position. When a lever is depressed, as shown in Fig. 7, the point of the lock lever 56 is raised above the detent rod 66, so that the rod bears against the lowerangular .surface 70, and thereby yieldingly holds the lever mechanism in the depressed position. A bail 71 is swingingly pivoted to the side walls of the frame 1, with the transverse portion resting on the upper edges of the The armature 72 of the release magnets 73.is mounted on a lever 74, which is pivoted to the frame bar 68. The

outer end of the lever 741 is linked to theniid- I die portion of the lever 75, which is pivoted at one end to a bracket 76 secured to, the frame member 68, and the outer end of the lever is in turn linked to the transverse portion of the bail 71. by means of the link 77. Near the end of the revolution. of the distributor wheel, the magnets 73 are energized, as will be described hereinafter, to pull downwardly on the bail 71 and force the raised link 56 back to normal position below the cross bar 66. The magnets 73 are supported by means of a bracket 78, which is ,attache-d. to the frame member 68, as best shown in Fig. 6.

The driving mechanism for the distributor shaft is as follows:,A constantly drivenmo tor 80 is mounted on the left side of the frame 1, and is provided with a speed governor 81, which is mounted on the outerend of the motor shaft 82. The governor may be of any well known. type, and serves to run the distributor operating motors 80 of each machine, substantially in synchronism. The worm 83 is fixed on the motor shaft 82 and meshes with the worm gear 84;, which is fixed on the hub of the brake drum 85. The drum is free to rotate onthe extended end of the volutionof the distributor wheel.

is rec-essedin the inner face of the -drum..

vVhen the coil 87 is energized the flange 88,

keyed to the shaft 86, is drawn into driving frictional contact with the face of the drum 85. Contact rings 89 are insulatingly mounted on, the periphery of the brake drum 85,.

and are connected to the opposite terminals of the coil 87. The current is communicated to the rings 89 through the brushes 90, which,

are stationarily mounted in an insulating block 91, secured to the support bracket 92,.

which in turn is attached to the adjacent wall of the frame 1. To assist in disengaging the brake members and 88, a spring 93 is mounted in recesses provided insaid members,laround the shaft 86.

For latching and releasing the distributor wheel, a spur gear 94 is rotatably mounted in the lower right hand portion of the frame 1 and meshes with a pinion 95 which is fixed on the distributor shaft 86. The pinion 95 is one-fourth the size of the gear 94;, and consequently the gear is turned onefourth of a revolution at each complete re- Tlie in: ncr face of the gear 94 is provided with four quadrantly arranged radial slots 96, which are engaged by the angular end of the latch lever 97, which is pivoted to the frame 1 and has the outer end urged into contact with the 99 is supported from the crossframe mem.-

ber 68 in position to attract the armature bar 100, which is attached to the lever 97. When the magnet 99 is energized the end of the latch lever 97 is withdrawn from a slot 96 and rides on the surface of the wheel 9%, under the tension of the spring 98, until the succeeding slot moves into relation with and is engaged by the end of the lock lever.

Then the latch lever 97 is in retracted position, that is, disengaged from one of the holding-slots 96, the lever closes a nor mally open clutch switch 101, which is mounted on the frame bar 68. A fibre block 102 is attached to lever 97 in position to engage with the adjacent spring leaf of the switch 101 and press that leaf into contact with the opposite leaf for closing the switch. Two cam operated switches -].03 and 10-1- are supported on an insulating block 105, at tached to the side of the frame 1. The outer switch 1021 is normally open and. is closed by. the projection 106 on the cam 107. secured to the distributor shaft 86, just before the revolution of the distributor wheel is completed. The inner switch 103 is closed when the distributor wheel is stopped. The up per leaf of this switch is provided with a projection which, in stopped position, engages in a notch in the surface of the aircular cam member 108, secured to the shaft 86, to allow the switch to close, and to open the switch when the cam'is rotating.

On the relay board 110, one of which is provided for each typewriter, are mounted the printing circuit magnets 111, 112, 113, lltand the starting magnet also the corresponding lock-up magnets 116, 117, 118, 119 and 120 and the relay switches 121 and 122.

The first four line magnets are continuously energized by current from the holding power battery 123, connected as shown in Fig. 1. Preferably a twelve volt battery is used, with the positive terminal connected through the holding winding 111 of the magnet 111, then through the holding winding 112 of the magnet 112, back to the negative terminal of the battery 123. The windings 111 and 112" are wound in opposite directions so that the polarities of the two corresponding line magnets are opposite, but are of the same value. The windings 113 and 111 of the two magnets 113 and 111 are similarly connected to the holding battery 103, but through a resistance 12-1, which causes the magnets 113 and 11-1 to beequally and oppositely energized, but at a lower amount than the two magnets 111 and 112. The line 125 connects through the releasing windings 126 of the first -tour magnets, in series, andthrough the single wind ing 127 of the clutch operating line magnet 115, tothe movable arm 128 of the twopole switch 122. As shown in. Fig. 1, the switch lever 128 is connected to a grounded terminal 130, which places that set in condition for receiving.

' The respective holding currents of the first four line magnets areso proportioned that an impulse from the one hundred volt positive terminal 131, in the sending set, deenergizes the first magnet 111; the impulse from the fifty volt positive terminal 132 deenergizes the fourth magnet 11 1; the impulse from the fifty volt negative terminal 133 (lo-energizes the magnet 113; and the negative one hundred volt terminal 131 deeni gizcs the magnet 112. The line magnet 115 is normally (lo-energized,and is energized by all impulses from the line 125.

vThe armatures 135 of the line magnets are vertically mounted and pivoted to the bases 136 of the respective magnets. The upper ends oi? the armature levers 135 operate between insulated contact points 137 and 138, which are adjustably mounted in the yoke 139, which is an extension of the magnet core "r-lt). The pull of the magnet is opposed by a contractile spring 111, which is attached to the levers 135 and to an adjusting screw 112. which is threaded into the upper end of the upright arm 1-13 which is mounted on the base.

In the type of magnet shown, the inner contact point 137 is adjusted so that the arm.

135 is held slightly out of actual contact with the'pole face 14 1, and the spring 141 may be given a comparatively strong tension to provide for quick acting.

Having described the general mechanical construction, the operating circuits will now be described: The outer contacts 138 of the first four line magnets are connected respectively to the armatures 145 of the corresponding lock-up magnets 116 to 119, and the inner contact 137 of the fifth. magnet 115 is connected to the armature 1415 of the magnet 120. nected trom the positive terminal to the armature lever 135 of the first line magnet 111. In the holding position the armature lever 135 then connects to the inner contact 137, which is connected to the armature levers 135 01 the succeeding magnet, through theinner contact 01 the same magnet to the next armature lever and contact to the armature lever 135 01' the iourth magnet 1191, where the connection ends, since no connection is made to the inner contact 137 of the fourth line magnet.

The positive side of the battery 1 16 also connects to the contact posts 147 01' the lock-up magnets 116 to 120 inclusive. Each of the windings 1-18 01 the first tour lock-up magnets is connected from the respective armature 11:3, through the coil to one terminal of each of the printing magnets 17 respectively. Thus when, for example, the magnet 118 is locked up, the battery 1-16 is connected through thearmature and the winding of the magnet to one side of the third printing magnet 17.

When the line magnet 115 is energized by a line impulse, the corresponding loch-up magnet 120 connects to positive terminal of the battery leti through the armature 1-15 and the magnet winding 14$) to one terminal 01' the latch release magnet 99.

The function of the live line magnets and the corresponding lock-up magnets may now be seen. The first four magnets are eli'cctivc for selectively energizing the tour rinting magnets. and the fifth magnet tor ener-. giziug the latch release magnet 99 to release the distributor wheel 15.

The positive terminal oi the local batter)- 146 is also connected to one side oi. the universal key switch 11 and the one terminal of the lever releasing magnet 73 and to the switch 39. The negative terminal of the battery is connected to the relay 122 and through the relay switch 150, through the relay 121. around to the upper arm of the switch 11, so that when switch 11 is closed. the relay 121 is energized momentarily through the closed switch 150 of the relay 122, through the windings of the magnet 121, through the key switch 11. back to the opposite side of the battery 146.

The negative side of the battery 146 is The local battery 1-16 is con also connected to one oi the brushes of the clutch 85, through the windings or the clutch and out through the opposite brush 90 to one terminal 01 the clutch switch 101, which is closed when the latch 97 is retracted. When the switch 101 is closed, connection is then continued around to the positive side of the battery by means of the line 151. The opposite terminal of the latch magnet 99 is connected to the movable switch arm 152, which connects either through the windings 153 of the magnet 15%, to one side oi the normal open switch 103, ordirectly to said switch 103. In the receiving set the switch arm is positioned to connect 'hrough the coil 153, and in sending position is connected directly to the switch 103, so that the magnet 154 is then cut out.

The magnet 15% is provided with a holding coil 155 and operates. an armature 156 against the action of a spring 157 to close the two switches, 158 for the holding coil 155, and 159 to close the negative side of the printing magnets to the negative terminal of the battery. The holding coil 155 is connected troin a switch 158-and to the negative side of the battery 1 16.

The lever release magnet 73 connects with the open switch. 10 1 to the negative terminal of 1 16.

The relay 122 attracts the armature 160 against the pull of the spring 161 to open the switch 150 and to close the switch 162.

The other relay 121 operates its armature 163 to close a line switch 164, and a switch for the relay 122.

The sending battery 166 comprises four 50 volt units which are connected in series and ground-ed betweenthe second and third units. In this manner the terminal 131 is made a positive terminal for volts; the terminal132 is 50 volts positive; 133 is 50 volts negative; and 134, 100 volts negative.

The upper leaves 60" of the sending switches 60 are connected together and to the connection 167. which leads to one side of the switch 164 and to the sending contact 168 of the hand operated switch lever 128. The lower leaves 60 are connected together in each of the four groups; the first group of contacts 60 is connected to the terminal 131, the second to terminal 134, the third to 138, and the fourth to plus 50, or 132. The terminal 132 is also connected to the switch 164 for making the first impulse. l/vhen any one of the switches 60 are closed, the second impulse is. given from the corresponding battery. through the switch contact 168 out to the line, when the lever 128 is in sending position, contacting with 168.

The relation of electrical parts shown in F 1 to the corresponding mechanical ele ments is shown in Fig. 1 which supplements and completes the diagram in Fig. 1.

The operation will now be described, reterringespecially to Fig. 2. When the key switch 11, in the sending machine at the left, is closed, current from the local battery 14.6 is communicated through the windings of the relay 121, through the normally closed switch 150 to the opposite terminal of the battery. This momentarily closes the switches164 and 165. An. impulse from the battery connection at is communicated through the switch 164: to the line, through the switch lever 128, which is in sending position, which impulse passes through the windings of all oi the line relay magnets of the sending machine, and also the line relays tor the receiving machine, whence the line is connected to the ground through the switch lever 128 in receiving position, which completes a circuit back to the ground of the sending battery 166. The first impulse, ener gizes both line magnets to lock up the armature 1 15 of the magnets 120. This simultaneously energizes both 01'? the latch releasing magnets 99 to retract the latches 97 and close the clutch switches 101 of both machines; The distributors 15 are then simultaneously connected to the synchronously operating motors 8 of each machine. When the switch 165 is closed by the magnet 121 the relay122 is energized. This breaks 1 the circuit torthe first relay 121by opening the switch1'50, and closes the switch 162 for holding the relay 122 energized. There- 1 by the line is momentarily connected for receiving the first impulse, and then the relay 122 is locked up through the hey switch 11 to hold the switch 150 open until the depressed key is released. Then, when the circuit for the depressed key is closed by the distributor closing the corresponding switch 60, the corresponding battery connection is madeto the line to send out the second 11D" pulse, since the switch arms 60" are all. connected to the line and the battery 166 is grounded. When the distributor 15 in the sending machine has completed one revolution the switch 104; is momentarily closed to energize the key releasing magnet 73, which causes the switch 11 to be opened. The switch 103 for the latch release magnet 99 is again closed by the operation of the cam 108.

The operations in the receivinganachine are as follows: The first impulse energizes. the line magnet 115, which attracts the corresponding armature to close and lock up the magnet 120. which connects the local battery power through the switch lever 152,. which is then in position to energize the coil 153 of the magnet 1545 through the normally closed switch 103. As soon as the distributor 15 starts to move, the latch 97 closes the switch 101, the circuit for the coil 153 is broken-by the switch 103, but the magnet 154, having been energized, closes the switch 

